AT&T 3.0 manual Opt, Opx

Glossary

N

network		Configuration of communications devices and software
		connected for information interchange.
network	interface	Hardware, software, or both that links two systems in an
		interconnected group of systems, for example, between
		the local telephone company and a PBX.

0

off-hook	Telephone is said to be off-hook when the user has lifted
	the handset, pressed the Speaker button to turn on the
	speakerphone, or used a headset to connect to the
	communications system or the telephone network.
off-premises	See OPT.
telephone
ones density	Requirement for channelized DS1 service to the public
	network that eight consecutive zeros cannot occur in a
	digital data stream.
on-hook	Telephone is said to be on-hook when the handset is hung
	up, the speakerphone is turned off, and the user is not
	using a headset to connect to the communications system
	or the telephone network.
OPT	(off-premises telephone) Single-line telephone or other
	tip/ring device connected to the system by an 008 OPT
	module in the control unit. Appears as an inside extension
	to the system, but may be physically located away from
	the system.
OPX	(off-premises extension)

GL–24Maintenance and Troubleshooting